Consequently the 20 micron filter element will let larger particles pass through the filter than the 5 micron media would. Bosch hepa premium cabin air filters are designed and tested to meet high efficiency particulate air hepa standards based on test standard astm d2986 and provide filtration efficiency of 99 97 at 0 3 microns. Bosch hepa premium cabin air filters provide filtration efficiency of 99 97 at 0 3 microns.
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